Behavior of Partly Crystallized Basaltic Magma Based on a Field and Laboratory Study of a Thick Flood Basalt

基于厚溢流玄武岩的现场和实验室研究的部分结晶玄武岩浆的行为

• 批准号: 9628269
• 负责人: Anthony Philpotts
• 金额: $ 11.7万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-07-01 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9628269&HistoricalAwards=false
• 关键词: Behavior; Partly; Crystallized; Basaltic; Magma

9628269 Philpotts It is proposed to investigate four different profiles through the Holyoke basalt using chemical analyses to define the degree of compaction and the partial melting technique to enhance textures for petrographic analysis. During compaction, the abundances of minerals and residual liquid change, but these phases are difficult to identify precisely in a thin section of crystalline rock. Yet it is important to know not only the abundance of liquid at a given stage of compaction, but also its distribution. In preliminary experiments on the Holyoke basalt, the P.I. found that by partly melting a sample, a clear picture of the amount and distribution of residual liquid can be obtained as a function of temperature. The experiments show that the crystal mush consisted of a network of chains of refractory minerals surrounding channels of liquid. In the experiment, the intrinsic permeability of the mush could also be determined. When applied to rocks that have undergone different degrees of compaction, the technique has the potential of determining how the solids and liquid redistributed themselves during compaction and thus of revealing the mechanisms involved. The results will provide quantitative data on the mechanisms and rates of compaction of crystal mush formed from quartz tholeiitic magma. Although determined with data from a surface flood-basalt flow, the results will be applicable to processes acting in the earth.

建议通过霍利奥克玄武岩研究四个不同的剖面，使用化学分析来确定压实程度，并使用部分熔融技术来增强岩相分析的结构。 在压实过程中，矿物和残余液体的丰度发生变化，但在结晶岩石的薄片中很难精确识别这些相。 然而，重要的是不仅要知道在给定的压实阶段的液体的丰度，而且还要知道其分布。 在对霍利奥克玄武岩的初步实验中，P.I.发现通过部分熔化样品，可以获得作为温度函数的残留液体的量和分布的清晰图像。 实验表明，晶体糊是由一个由难熔矿物链组成的网络包围着液体通道。 在实验中，还可以确定糊状物的固有渗透性。 当应用于岩石，经历了不同程度的压实，该技术有可能确定如何固体和液体重新分配自己在压实过程中，从而揭示所涉及的机制。 研究结果将为石英拉斑玄武岩岩浆结晶泥的压实机制和压实速率提供定量数据。 虽然确定的数据从表面洪水玄武岩流，结果将适用于在地球上的过程。